2-stilbenyl-4-styryl-v-triazoles

ABSTRACT

WHEREIN X1 denotes hydrogen, halogen, methyl or optionally substituted phenyl, R1 denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms, optionally substituted phenyl or alkoxy with 1 to 4 carbon atoms, or together with R2 in the o-position denotes a fused benzene ring, R2 denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms, or together with R1 in the o-position denotes a fused benzene ring, R3 denotes hydrogen, a nitrile group, an optionally functionally modified sulpho group or an optionally functionally modified carboxyl group, R4 denotes hydrogen, halogen, a nitrile group, alkyl with 1 to 4 carbon atoms, optionally substituted phenyl, alkoxy with 1 to 4 carbon atoms, optionally functionally modified carboxyl or an optionally functionally modified sulpho group and R5 denotes hydrogen, alkyl with 1 to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms. The new compounds are useful as optical brighteners for organic materials.   The present invention relates to new v-triazoles of the formula

United States Patent n 1 Kabas et al.

[ Jan. 21, 1975 2-STILBENYL-4-STYRYL-V-TRIAZOLES [75] Inventors: Guglielmo Kabas, Binningen; Hans Schlaepfer, Basle; Ian John Fletcher, Muenchenstein, all of Switzerland [30] Foreign Application Priority Data Mar. 31, 1971 Switzerland 4702/71 [52] U.S. Cl. 260/240 C, 117/335 T, 252/3012 W, 252/543, 260/240 D Primary Examiner-G. Thomas Todd Attorney, Agent, or FirmJoseph G. Kolodny; Edward McC. Roberts; Prabodh I. Almaula [57] ABSTRACT The present invention relates to new v-triazoles of the formula wherein X, denotes hydrogen, halogen, methyl or optionally substituted phenyl, R, denotes hydrogen, halo gen, alkyl with 1 to 4 carbon atoms, optionally substituted phenyl or alkoxy with l to 4 carbon atoms, or together with R in the o-position denotes a fused benzene ring, R denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms, or together with R, in the o-position denotes a fused benzene ring, R, denotes hydrogen, a nitrile group, an optionally functionally modified sulpho group or an optionally functionally modified carboxyl group, R denotes hydrogen, halogen, a nitrile group, alkyl with 1 to 4 carbon atoms, optionally substituted phenyl, alkoxy with 1 to 4 carbon atoms, optionally functionally modified carboxyl or an optionally functionally modified sulpho group and R denotes hydrogen, alkyl with l to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms.

The new compounds are useful as optical brighteners for organic materials.

3 Claims, No Drawings 1 2-STIBLENYL-4-STYRYL-V-TRIAZOLES The present invention relates to the new v-triazoles, the use of these triazoles for the optical brightening of synthetic or natural organic materials, and the process for the manufacture of the compounds.

The new v-triazoles correspond to the formula wherein X, denotes hydrogen, halogen, methyl or optionally substituted phenyl, R, denotes hydrogen, halogen, alkyl with l to 4 carbon atoms, optionally substituted phenyl or alkoxy with l to 4 carbon atoms, or together with R in the o-position denotes a fused benzene ring, R, denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms or alkoxy with l to 4 carbon atoms, or together with R, in the o-position denotes a fused benzene ring, R denotes hydrogen, a nitrile group, an optionally functionally modified sulpho group or an optionally functionally modified carboxyl group, R denotes hydrogen, halogen, a nitrile group, alkyl with l to 4 carbon atoms, optionally substituted phenyl, alkoxy with l to 4 carbon atoms, optionally functionally modified carboxyl or an optionally functionally modified sulpho group and R denotes hydrogen, alkyl with l to 4 carbon atoms or alkoxy with l to 4 carbon atoms.

The terms optionally functionally modified carboxyl and optionally functionally modified sulpho group can in general be expressed by the partial formulae -COOZ and CON(Z,Z or -SO;,Z, -SO Z and SO N(Z,Z respectively; herein, Z denotes hydrogen, alkyl with 1 to 18, preferably 1 to 4, carbon atoms, optionally substituted phenyl or benzyl, Z, denotes hydrogen, alkyl with l to 6, preferably 1 to 4, carbon atoms, wherein the terminal carbon atom can be substituted by a dialkylamino group with l to 4 carbon atoms per alkyl part, or optionally substituted phenyl, 2, denotes hydrogen, alkyl with l to 6, preferably 1 to 4, carbon atoms, or together with Z, and the nitrogen atom denotes a morpholino radical which is optionally substituted by alkyl with l to 4 carbon atoms, and Z denotes alkyl with 1 to 4 carbon atoms or optionally substituted phenyl. Furthermore Z, in particular in the case of the sulpho group, represents an alkali metal atom, especially sodium, the ammonium group or an amine.

Preferred halogens (for the symbols X,, R,, R,, R,, and R are bromine and especially chlorine.

As alkyl radicals with 1 to 4 carbon atoms (for the symbols R, and R tert. butyl, n-butyl, propyl, ethyl land especially methyl may be mentioned as examples.

Preferred alkyl groups with l to 4 carbon atoms are methy, ethyl and tert. butyl.

2 Tert. butyl, ethyl, methyl, ethoxy, methoxy and chlorine are preferred as substituents for the phenyl radicals of the symbols X,, R,, R and Z.

The formula (1) for example includes the com pounds of the formula wherein X, denotes hydrogen or chlorine, R,, denotes hydrogen, chlorine, bromine, alkyl with l to 4 carbon atoms or phenyl, R, denotes hydrogen, chlorine, alkyl with l to 4 carbon atoms or alkoxy with l to 4 carbon atoms, R,, denotes hydrogen, a nitrile group, an optionally functionally modified sulphonic acid group or an optionally functionally modified carboxyl group, R,, denotes hydrogen, chlorine, alkyl with l to 4 carbon atoms, alkoxy with l to 4 carbon atoms, phenyl, optionally functionally modified carboxyl or an optionally functionally modified sulpho group and R,,, denotes hydrogen, alkyl with l to 4 carbon atoms or alkoxy with l to 4 carbon atoms.

Preferred 2-stilbenyl-4-styryl-v-triazoles correspond to the formula crkg n wherein X, denotes hydrogen or chlorine, R,, denotes hydrogen, alkyl with l to 4 carbon atoms, chlorine, methoxy or phenyl, R,, denotes carbonamide, a nitrile group, a sulpho group or its sodium salt, SO Y, wherein Y represents methyl, ethyl, methoxy, ethoxy, phenoxy optionally substituted by alkyl with l to 4 carbon atoms or an alkylamino group with l to 4 carbon atoms, wherein the terminal carbon atom can be substituted by a dialkylamino group with l or Zcarbon atoms per alkyl part, R,,, denotes hydrogen, chlorine, methyl, methoxy, phenyl, carbonmethoxy or carbethoxy and R,,, denotes hydrogen or methoxy.

The radical R,, is in general in the meta-position or especially in the para-position to the ethylene bridge.

The compounds of the formula 1, wherein X, denotes hydrogen, methyl or optionally substituted phenyl, are manufactured if one mol of water is eliminated under the action of an acid condensation agent, and optionally with heating, from a compound of the formula where X, represents hydrogen, methyl or optionally substituted phenyl and R,, R R R, and R have the indicated meaning.

As examples of acid condensation agents there may be mentioned the hydrogen halide acids, the inorganic anhydrides, phosphorus pentoxide and sulphur trioxide, the mixed inorganicorganic anhydrides, such as the alkanoyl and aroyl, alkylsulphonyl and arylsulphonyl halides, for example acetyl chloride, benzoyl chloride and toluenesulphochloride, as well as the purely organic anhydrides, such as acetic anhydride, benzoic anhydride and also the mixed anhydride of formic acid and acetic acid.

The condensation can be carried out in the presence of organic solvents which are inert under the reaction conditions. As such, it is possible to use high-boiling hydrocarbons and halogenated hydrocarbons, for example chlorobenzene, dichlorobenzene, and xylene; it is also possible to use inert slightly basic or more strongly basic solvents, for example dimethylformamide, dimethylacetamide or pyridine, picolines and quinolines. Dependingon the substituents of the oximehydrazones, the cyclisation can be effected by simply leaving the reaction mixture to stand or by heating the reaction mixture. Possible reaction temperatures are temperatures between room temperature and 250C, preferably lOO to 150C. In some cases, the presence of basic catalysts, such as anhydrous alkali salts or alkaline earth salts or organic acids, for example sodium acetate or potassium acetate, brings favourable results as regards the yields and purity of the end products. The progress of the cyclisation reaction can best be followed in thin layer chromatograms. The transient occurrence of O-acylated intermediate stages in the case where mixed inorganicorganic or purely organic acid anhydrides are used, is of only insignificant importance for the course of the reaction.

As a modification of the process just described, the compounds mentioned are also obtained by bringing about the cyclisation in a compound of the formula (4) oxidatively and reducing the resulting v-triazole-loxide compound with nascent hydrogen to give a compound of the formula (1).

The oxidative cyclisation can be effected by the action of the most diverse oxidising agents; at the same time, it is advisable to work in oxidation-resistant solvents. In basic solvents, such as pyridine or pyridinewater mixtures, potassium ferricyanide can for example be used. The generally applicable and therefore preferred process is the oxidation with cupric sulphate in pyridine-water. For this, it is not necessary to use stoichiometric amounts of copper, because the monovalent copper produced during the reaction can constantly be reconverted to the divalent stage during the reaction by blowing in air or oxygen. The oxidation with cupric salts, such as cupric sulphate or cupric chloride, can advantageously also be carried out in methanol or methanol/water, in the presence of ammo nium salts or amine salts.

. R NHQCEBCHQ The reduction with base metals and acids, such as zinc dust in acetic acid or acetic acid-water mixtures, is advantageously chosen for the reduction of the triazole-oxides to the triazoles in accordance with known methods. However, salts of reducing acids of sulphur or phosphorus can also be used for the reduction.

The route via the triazole-oxide is particularly indicated for the manufacture of compounds of the formula (1), wherein X, represents halogen. The halogenation and the reduction of the oxide to the end product can in that case be carried out in one step.

The starting substances for the manufacturing process according to the invention, or for the modified process, can be obtained in a known manner.

A compound of the formula 4 can be manufactured, for example, by reaction of a diketone of the formula wherein R,, R and X, have the abovementioned meaning, with a compound of the formula wherein R,, R and X, have the abovementioned meaning, and reaction of the resulting oxime of the formula 2 0 NOH with a compound of the formula 6 or by coupling of the diazotised compound of the formula wherein a, R, and R have the abovementioned meaning, with a ketone of the formula 7 or with a kctoaldehyde of the formula =01. cc x R2 u l o cao wherein R,, R and X, have the indicated meaning, and reaction of the azo compound with hydroxylamine.

The introduction of functionally modified carboxyl groups and sulpho groups (especially for R is advantageously only carried out on the triazole compound, in accordance with known methods.

The compounds according to the invention are distinguished by good compatibility with high molecular, organic substances. The new optical brighteners are suitable for the whitening of high molecular materials, such as polyolefines, for example polyethylene or polypropylene, and also polyvinyl chloride and polyacrylonitrile, but above all polyesters, especially polyesters of aromatic polycarboxylic acids with polyhydric alcohols, such as polyterephthalic acid glycol esters, synthetic polyamides, such as nylon-6 and nylon-66, and also cellulose esters, such as cellulose acetates, and also cellulose. Those compounds which contain groups which confer solubility in water, such as, for example, the sulphonic acid group, are especially suitable for brightening cellulose substrates.

The optical brightening of the high molecular colourless organic material is for example effected by incorporating therein small amounts of optical brighteners according to the invention, for example 0.0001 to 2%,

preferably 0.0005 to 0.5%, relative to the material to be brightened, optionally together with other additives, such as plasticisers, stabilisers or pigments. The brighteners can for example be incorporated into the plastics as solutions in plasticisers, such as dioctyl phthalate, or together with stabilisers, such as dibutyl tin dilaurate or sodium pentaoctyl-tripolyphosphate, or together with pigments such as, for example, titanium dioxide. Depending on the nature of the material to be brightened, the brightener can also be dissolved in the monomers before polymerisation, in the polymer composition or, together with the polymers, in a solvent. The material pre-treated in this way is thereafter converted to the desired final shape in accordance with processes which are in themselves known, such as calendering, pressing, extrusion, spreading, casting and above all spinning and stretching. The brighteners can also be incorporated into finishes, for example into finishes for textile fibres, such as polyvinyl alcohol, or into resins or resin precondensates such as, for example, methylol compounds of ethyleneurea, which are used for the treatment of textiles.

Preferably, colourless, high molecular organic mate rial is also brightened in the form of fibres. A dispersion or solution of v-triazoles of the formula (1) according to the invention is advantageously used for the brightening of these fibre materials. The brightener dispersion or solution here preferably contains 0.005 to 0.5% of the v-triazole according to the invention, relative to the fibre material. In addition, the dispersion or solution can contain auxiliaries, such as dispersing agents, for example condensation products of fatty alcohols, possessing 10 to 18 carbon atoms, or alkylphenols with to mols of ethylene oxide, or condensation products of alkylmonoamines or polyamines possessing 16 to 18 carbon atoms with at least 10 mols of ethylene oxide, organic acids such as formic, oxalic or acetic acid,

detergents, swelling agents such asa dichlorobenzcnes or trichlorobenzenes, wetting agents such as sulphosuccinic acid alkyl esters, bleaching agents such as sodium chlorite, peroxides or hydrosulphites and, optionally, brighteners of other categories such as, for example, derivatives of stilbene which possess affinity for cellulose.

The brightening of the fibre material with the aqueous brightener treatment bath is effected either by the exhaustion process, at temperatures of, preferably, 30 to 150C, or by the padding process. In the latter case, the goods are impregnated with a brightener preparation of, for example, 0.2 to 0.5% strength, and are finished by, for example, dry or moist heat treatment, for example by steaming at 2 atmospheres or, after drying, by brief dry heating to 180 to 220C, in the course of which the fabric is at the same time thermofixed, if appropriate. The fibre material treated in this way is finally rinsed and dried.

Colourless high molecular organic material optically brightened in accordance with the invention, especially the synthetic fibre material brightened in accordance with the exhaustion process, shows an attractive, pure white, blueviolet to bluish-tinged fluorescent appearance; material of this nature dyed in light colour shades and whitened according to the invention is distinguished by a pure colour shade.

The v-triazoles of the formula 1, according to the invention, can also be added to detergents, and the latter can be used for brightening textiles.

The content of optical brightener of the detergents is advantageously 0.001 to 0.5% by weight, relative to the solids content of the detergent.

Washing liquors which contain v-triazoles of the formula 1 according to the invention, when used for washing, impart a brilliant appearance in daylight to the textile fibres treated with the liquors, for example cellulose fibres or synthetic polyamide, polyester, polyolefine and cellulose ester fibres. They can therefore in particular he used for washing these synthetic fibres or in the textiles or constituents of textiles consisting of such fibres, and for washing laundry.

EXAMPLE 1 A suspension of 27.1 g of 4-hydrazino-2-cyano-stilbenehydrochloride and 21 g of benzalisonitrosoacetone in 200 ml of methanol, ml of glacial acetic acid, 80 ml of water and 20.2 g of triethylamine is stirred for 4 hours at room temperature and 6 hours at 60C. Thereafter the reaction mixture is cooled to 10C and filtered and the filtered residue is washed with methanol/water. After drying, 29.5 g, corresponding to 76.5% of theory, of hydrazone-oxime, of melting point 194 to 195C, are obtained.

A mixture of 39.2 g of the hydrazone-oxime and 29.4 g of anhydrous potassium acetate in ml of dimethylformamide is warmed to 40C. 51 g of acetic anhydride are added dropwise at this temperature over the course of 30 minutes, whereupon the temperature rises to 75C. The reaction mixture is then brought to 105C and is stirred for 4 hours at this temperature and then for 1 hour at C. After cooling, the product is filtered off, washed with cooled methanol and subsequently with water until the filtrate reacts neutral, and is then dried.

After repeated recrystallisation from chlorobenzene with the aid of fullers earth, 27 g, corresponding to 72.3% of theory, of the compound of the formula (11) Q-cu-cu CN are obtained as a white powder of melting point 172 to 173C.

The compound thus obtained is an excellent agent for brightening plastics and synthetic fibres.

The compounds of the formula (12) listed in table I are manufactured analogously. They have similar properties to the abovementioned product.

N H: N -CH=C11 v n Qv.

Table I Formula V V V Melting point, uncorrected, in C (13) CN H OCl-l 186 188 (14) -CN OCH; OCH: 163 164 (l) CN CH 163 l65 (16) CN H Cl 200 203 (17) CN H C H: 204 205 (18) CN H COOC H 182 183 (19) CONH, H 266 268 (20) SO NHC H, H H 197 198 (21) SO CH H H 182 183 (22) SO C l-l H H 188 189 (23) SO Cl-l H Cl-l 200 201 If instead of benzalisonitrosoacetone an equivalent amount of the isonitrosoacetone derivatives listed below, such as o-chlorobenzal-isonitrosoacetone, mchlorobenzalisonitrosoacetone, p-chlorobenzalisonitrosoacetone, p-methylbenzal-isonitrosoacetone, pmethoxybenzal-isonitrosoacetone or p-tert. butylbenzal-isonitrosoacetone is used and in other respects the same procedure as described above is followed, the brighteners of the formula 24 listed in table II below are obtained, which can be used in the same manner:

ere-Q v Table ll Formula V V Melting point in C (uncorrected) (25) 4CH;, COOC,H 212 215 (26) 4Cl COOC,H, 206 207 27) 3-c1 -c0oc,H, 188 11m (28) 2-Cl COOCgHg, 208 209 (29) 4-OCH COOQH 210- 211 (30) 4-C(CH COOC H, 196 197 (31) 4-Cl 182 184 (32) 3Cl H 170-171 (33) 2Cl H 165 166 (34) 4C(CH;,) H 174 176 (35) 4-CH; H 198 199 (36) ti-OCH: H 179 181 The 4hydrazino-2-cyanostilbene-hydrochloride used above is obtained as follows:

A suspension of 220 g of 4-amino-2-cyano'stilbene, 500 ml of water and 800 g of coarse quartz sand is vigourously stirred for 18 hours at room temperature. The fine suspension is diluted with 2,000 ml of water, the quartz sand is filtered off, 255 ml of hydrochloric acid are added and diazotisation is carried out with 69 g of sodium nitrite in 300 ml of water at 0 to 5C. A viscous, orange diazo suspension is produced, which is allowed to complete diazotisation for 2 hours at 5 to 8C. The diazonium salt suspension thus obtained is added dropwise, over the course of 40 minutes, to a suspension of 302 g of sodium sulphite and 24 g of sodium pyrosulphite in 700 ml of water at 20 to 25C. The pH value is kept at 7.3 by adding dilute sodium hydroxide solution. An ochre-coloured suspension is produced, which is allowed to complete reaction by stirring for 30 minutes at 20 to 25C. Thereafter the reaction mixture is heated to C, whilst maintaining the pH value at 7.3 by adding hydrochloric acid, and is stirred for 4 hours at this temperature. The cloudy solution of the hydrazine-N-disulphonic acid is clarified and run into a mixture of 600 ml of hydrochloric acid and 200 ml of water pre-warmed to 60C, whereupon the hydrazine hydrochloride precipitates as a brownish product. The mixture is subsequently stirred for 6 hours at 70 to C and cooled to 20C, and the product is filtered off.

After drying, 200 g, corresponding to 74% of theory, of 4-hydrazino-2cyanostilbene hydrochloride of melting point to 197C (with decomposition) are obtained.

The hydrazine hydrochlorides of the formula v1.1]. with decomposition EXAMPLE 2 A suspension of 27.1 g of 4-hydrazino-2- cyanostilbene hydrochloride and 21 g of benzalisonitrosoacetone in 200 ml of methanol, 80 ml of glacial acetic acid, 80 ml of water and 20.2 g of triethylamine is stirred for 4 hours at room temperature and 6 hours at 60C. 11.5 g of ammonium acetate and 25.5 g of cupric chloride are now added and the mixture is boiled for a further 24 hours under reflux. Thereafter the reaction mixture is cooled to 10C and filtered, and the filter residue is washed with dilute hydrochloric acid fullers earth. The compound of the formula 11 is thus obtained.

If instead of the 27.1 g of 4-hydrazino-2' cyanostilbene hydrochloride equivalent amounts of the stilbenehydrazine hydrochlorides of the formulae 38 to 48 are used, and otherwise the same procedure is followed, the 2-stilbyl-4-styryl-v-triazoles of the formulae 13 to 23 are obtained.

EXAMPLE 3 39 g of 2-(2-cyanostilb-4-yl)-5-styryl-v-triazole-3- oxide, manufactured as described in the first paragraph of Example 2, in a mixture of 1,000 ml of dioxand and 200 ml of water, are brought to the reflux temperature.

On reaching the boiling point, hydrochloric acid gas is passed in for 8 hours, 300 ml of water are thereafter added and the reaction mixture is then cooled. The resulting crystalline precipitate is filtered off and washed with methanol. After three recrystallisations from chlorobenzene with the aid of fullers earth, the compound of the formula Q cnacn N on is obtained in the form of light yellow crystals of melting point 189 to 191C, which dissolve in chlorobem zene to give an intense blue-violet fluorescence.

The compound imparts a brilliant white effect to fibres of polyesters, polyamides and polypropylene. It can also be added, with good success, to spinning compositions.

Compounds of the formula (50) which have a similar effect are obtained if, whilst otherwise using the same procedure, equivalent amounts of 2-substituted 5-styryl-v-triazole-3-oxides N s V 3 @ca=ca N v V l are used instead of the 39 g of 2-(2-cyanostilb-4yl)-5- styryl-v-triazole-3-oxide.

Table IV Formula V V2 V3 Melting point in C (uncorrected) (51) CN -H oCH 216-218 (52) CN -OCH;, OCH; 193 194 (53) CN --H -CH 183 134 54) -CN -H Cl 235 236 (55) CN H c.,11 190 191 (56) CN -11 -COOC2H5 [67 168 (57) C0-NH -11 -11 290 292 (58) -SO NHC H -H H 220 222 (59) -so,c11, -H -H 233 234 (60) -SO2C,H, -H CH 175 I76 (61) -s0,CH, H -CH 222 224 If instead of benzalisonitrosoacetone an equivalent amount of the isonitrosoacetone derivatives listed below, such as o-chlorobenzal-isonitrosoacetone, mchlorobenzalisonitrosoacetone, p-ehlorobenzalisonitrosoacetone, p-methylbenzal-isonitrosoacetone, p-methoxybenzal-isonitrosacetone or p-tert. butylbenzal-isonitrosoacetone is used, and in other respects the same procedure as described above is followed, the brighteners of the formula Cl N 11" ii 1 q 3 listed in table V below are obtained, which can be used in the same manner.

EXAMPLE 4 29 g of 4-hydrazinostilbene-2-sulphonic acid are suspended in 400 ml of water and 1 ml of approx. 40% strength sodium sulphite solution at 40C. The pH value is adjusted to 10 by adding ammonia. A solution of 21 g of benzalisonitrosoacetone in 400 ml of methano] is rapidly added and the pH value is adjusted to 6.0 by adding acetic acid. The redbrown suspension is stirred for 20 hours at 30C and thereafter the bulk of the methanol is distilled off under reduced pressure. The mixture is now cooled to 20C. and adjusted to a pH value of 2 with concentrated hydrochloric acid, and the product is filtered off, washed with 10% strength sodium chloride solution and dried in vacuo at 40C.

47 g of the oxime-hydrazone thus produced, in 700 ml of acetic anhydride, 10 g of anhydrous sodium acetate and 20 ml of dimethylformamide are heated to 104C over the course of 3 hours and stirred at this temperature for 8 hours. The mixture is then evaporated in vacuo, the residue is boiled up with 100 ml of water and 20 ml of sodium hydroxide solution and cooled, and the product is salted out and filtered off.

This salt, of the formula 70) N ca=cH-@ @ca=ca N 1121 are obtained, which can be used in the same manner. V 2Cl, 3-Cl, 4Cl, 4C 3, 3)s OCl-l or 4C H EXAMPLE 5 44.8 g of 4-(4-styryl-v-triazole-2-yl)-stilbene- Z-sulphochloride are suspended in 800 ml ofdry chlorobenzene and the suspension is cooled to 5C. 13.5 g of ethylamine are passed in at this temperature and thereafter the mixture is stirred for 6 hours at 10 to 15C and 3 hours at 130 to 135C. After adding 50 ml of a saturated sodium carbonate solution, the mixture is steam-distilled. The residue is filtered off, washed with water and dried. After repeated recrystallisation from chlorobenzene with the aid of fullers earth, 32.9 g, corresponding to 72% of theory, of the compound of the formula (20) of melting point 197 to 198C are obtained.

If instead of 13.5 g of ethylamine an equivalent amount of 3-dimethylamino-l-propylamine is used and otherwise the same procedure is followed, the compound of the formula SO NH-CH CH CH N (CH is obtained. The 4-(4-styryl-v-triazole-2-yl)-stilbene-2- sulphochloride used above is obtained as follows:

205 g of 4-(4-styryl-v-triazole-2-yl)-stilbene-2- sulphonic acid (sodium salt) are introduced into 500 ml of dried chlorobenzene and the temperature is brought to C. Thereafter 188 g of phosphorus oxychloride are introduced over the course of 30 minutes and the temperature is then raised to C, whereupon an almost clear solution is slowly produced, with evolution of hydrochloric acid gas. After 6 hours, the bulk of the chlorobenzene as well as the excess phosphorus oxychloride are distilled off under reduced pressure. After cooling, ice and water are added and the sulphonic acid chloride which has precipitated is filtered off, washed with ice water and dried.

EXAMPLE 6 22.3 g of the 4-(4-styryl-v-triazole-2-yl)-stilbene-2- sulphochloride described in Example 5 are introduced into an aqueous solution of 7.5 g of phenol and 5 g of sodium hydroxide over the course of 30 minutes at 60 to 65C and the mixture is stirred at a pH value of 9 until the reaction is completed. The crude phenol-ester of the formula which is thereby formed is filtered off after cooling, and is dried. After repeated recrystallisation from chlorobenzene with the aid of fullers earth, a yellowish powder is obtained.

The product is an excellent brightener for various polymeric plastics, such as the polymers and copolymers of vinyl chloride, vinylidene chloride, styrenes and ethylenes. A product of entirely similar action is obtained if in the above example the phenol is replaced by 8.1 g of p-cresol. The compound of the formula N and 3 g of polyamide fabric are then introduced into the solution. The temperature is raised to 92 95C (74) N-- H=CH over the course of to minutes and is left thereat for 30 minutes. The fabric is then rinsed for 2 minutes 5 in running cold water and is subsequently dried for so -O-CH minutes at 60C.

2 The fabric treated in this way shows a distinct brightening effect. then obtained {is a yellowish powder If instead of the abovementioned brightener the same If the phenol 13 further replaced by g of p' 10 amounts of optical brightener of the formulae l5, l7. tcrt'butylphenol' the compound of the formula 19, 49, 53, 54, 55, 58 or 60 are used and otherwise the is obtained as a yellowish powder which is an effective S3016 Procedure 15 followed, Similar ff a brightener for the most diverse organic polymers. tamed- P EXAMPLE 7 EXAM LE 10 0.2 g of trichlorobenzene is added to 100 ml of water. 5 Glauber added to 100 m] of water A solution of the optical brightener of the formula A solution of the optical brightener of the formula (70) (i1) is prepared by dissolving 1 g in 1,000 m] of is manufacture? by dissolvlflg 1 g in 1,900 ml of methylformamide. 1.5 ml of this stock solution are methylformamide. 2ml of this stock solution are added added to the Solution described above, Thi aqueous to the solution described above. This aqueous solution Solution containing the brightener i warmed to 60C containing the brlghte e 1S warmed 40 45 3 g and a polyester fabric weighing 3 g is then introduced of a previously bleached cotton fabric are then introinto the solution The temperature i i d to 95 duced into the solution and treated for 30 minutes at Over the Course f 10 to 15 minutes d i l ft i p 'f The fabric F then rinsed for thereat for 1 hour. The fabric is then rinsed for 2 minutes in running cold water and is subsequently dried for utes in running d water d i b quently dried for 20 minutes at 60C. 20 inutes at 60C.

The fabr c treated in this y Shows a distinct bright The fabric treated in this way shows a distinct brightening effect. ening effect.

If instead of the abovementioned brightener the same EXAMPLE amounts of an optical brightener of the formula 15, 16, gofalkyl-polyglycol-ether1S addedto 100 ml of l7, 19, 49, 53, 54 or 58 are used and otherwise the water. A solution of an optical brightener of the forsame procedure is f ll d similar results are mula 11 is manufactured by dissolving l g in 1,000 ml i i of dimethylformamide. 3 ml of this stock solution are EXAMPLE 1] added to the solution described above. This aqueous solution or dispersion containing the brightener is g of mchlombenzene g of 80% Strength warmed to C and 3 g of a nylon fabric are then indium {hlorlti of Sodium nitrate and g f troduced into the solution. The temperature is raised to or eqlflvalent amOPm of another Orgamc of 92 95 over the course f 10 to 5 minutes and is inorganic acid suitable for this purposes are added to left thereat for 30 minutes. The fabric is then rinsed for 100 ml Water- 2 minutes in running cold water and is subsequently 50 A 5911mm of the opium] brightener 0f the formula dri d f r 20 i t at 60C (11) is prepared by dissolving 1 g in 1,000 ml of di- The fabric treated in this way shows a distinct brightmethylfofmamideml Of this Stock llti n ar ening ff t, added to the solution described above. This aqueous If i t d f th brightgner f h f l ii the solution containing the brightener is warmed to 60C same amounts of an optical brightener of the formulae 55 and 3 g of a polyfister fabric are thcn introduced into 15 17 19 49, 53, 55, o are used and otherwise the solution. The temperature is raised to 98C the same procedure is followed, similar results are obe the Course 0f 15 to 20 minutes and is left thereat tained. for 60 minutes. The fabric is then rinsed for 2 minutes in running cold water and is subsequently dried for 20 EXAMPLE 9 60 minutes at 60C.

0.12 ml of 85% strength formic acid and 0.06 g of al- The fabric treated in this way shows a distinct brightkyl-polyglycol-ether are added to ml of water. ening effect.

A solution of the optical brightener of the formula 1 1 If instead of the abovementioned brightener the same is prepared by dissolving l g in l,000 ml of dimethyl- 65 amounts of an optical brightener of the formula l5, 16, formamide. 3 ml of this stock solution are added to the l7, 19, 49, 53, 54 or 58 are used and otherwise the solution described above. This aqueous solution or dissame procedure is followed, similar effects are ob- -persi0ri containing the brightener is warmed to 60C tained.

EXAMPLE 12 A solution ofthe optical brightener ofthe formula 11 is prepared by dissolving l g in 1,000 ml of dimethylformamide. A polyester fabric is padded with this solution (20C) (squeezing-out effect 50 to 60%, roller pressure 30 kg/cm speed 3 m/minute). The fabric is subsequently fixed for 30 seconds at 200C.

The fabric treated in this way shows a distinct brightening effect.

If instead of the abovementioned brightener the same amounts of an optical brightener of the formulae 15, 16,17,18,19, 49, 53, 55,56 or 58 are used and otherwise the same procedure is followed, similar effects are obtained.

EXAMPLE 13 0.4 g of detergent of the following composition is added to 100 ml of water:

15.2% of dodecylbenzenesulphonate 3.8% of dodecyl alcohol sulphonate 25.6% of Na tripolyphosphate 4.8% of waterglass 1.9% of Mg silicate 5.0% of sodium carbonate 1.4% of carboxymethylcellulose 0.3% of ethylenediaminetetraacetic acid 34.4% of sodium sulphate.

A solution of the optical brightener of the formula (ll) is prepared by dissolving l g in l,000 ml of methylcellosolve. 0.8 ml of this stock solution is added to the solution described above. This aqueous dispersion containing the brightener is warmed to 55C. g of a polyester fabric are then introduced into the solution and treated at this temperature for 15 minutes. After this wash, the fabric is rinsed firstly with lukewarm water and then with cold water.

The washing process described above is carried out with the same fabric, but a fresh wash liquor in each case, for a total of 15 times. A polyester fabric which shows an attractive white effect in daylight is thereby obtained.

The fact that a good white effect is also obtained on other fibres is shown by the following:

If in the preceding example the 5 g of polyglycol terephthalate fabric are replaced by 5 g of a synthetic polyamide fabric, for example nylon, and in other respects the procedure indicated above is followed, a very attractive white shade is obtained on this fabric also.

If the brightener mentioned, of the formula 1 1 is replaced by the same amount of an optical brightener of the formula I5, 16, l7, 18, 23, 49 or 56, similar effects are obtained, after the 15-fold wash and otherwise under the same conditions as described above, on polyglycol terephthalate fabrics and on nylon fabrics.

EXAMPLE 14 0.06 g of 40% strength acetic acid and 0.06 g of alkylpolyglycol-ether are added to 100 ml of water.

A solution of the optical brightener of the formula 1 1 is prepared by dissolving 1 g in 1,000 ml of dimethylformamide. 1.5 ml of this stock solution are added to the solution described above. This aqueous dispersion containing the brightener is warmed to 60C; 3 g of a polypropylene fabric are then introduced into the solution. The temperature is raised to 9598C over the course of to 15 minutes and is left thereat for 30 minutes. The fabric is then rinsed for 2 minutes in run ning cold water and subsequently dried for 20 minutes at 60C. The fabric treated in this way shows a distinct brightening effect.

If instead of the abovementioned brightener the same amounts of a brightener of the formula l5, l6, 17, 49, 53, 54 or 55 are used and otherwise the same procedure is followed, similar effects are obtained.

EXAMPLE 15 parts of polypropylene are homogenised with 0.5 part of titanium dioxide and 0.05 part of the optical brightener of the formula (11 in a kneader at 200C. The melt is spun through spinnerets under an inert gas at 2 to 3 atmospheres gauge and at a temperature of 280 to 300C in accordance with known methods. The polypropylene filaments thus obtained are distinguished by a high degree of whiteness.

lfinstead of the abovementioned brightener the same amounts of an optical brightener of the formula 15, 17, 49, 53 or 55 are used and otherwise the same procedure is followed, similar effects are obtained.

EXAMPLE 16 In a kneader, 67 parts of polyvinyl chloride powder, 33 parts of dioctyl phthalate, 2 parts of di-n-butyldilauryldioxystannate, 0.3 part of sodium pentaoctyltripolyphosphate and 0.05 part of the optical brightener of the formula (11) are gelled for 15 minutes on a mixing mill at l60C and subsequently sheeted. The polyvinyl chloride sheet thus produced shows a strong fluorescence, and a brilliant white appearance, in daylight.

lfinstead of the abovementioned brightener the same amounts of an optical brightener of the formula l4, l5, 17, 20, 23, 25, 27, 34, 49, 58 or 59 are used and otherwise the same procedure is followed, similar effects are obtained.

EXAMPLE 17 1,000 parts of polyester granules of polyethylene glycol terephthalate are intimately mixed with 0.25 part of the optical brightener of the formula (11) and then spun in a known manner under nitrogen from an extruder at a temperature of 265 to 285C through a spinneret to give filaments. The polyester filaments thus obtained show a brilliant white appearance.

If the procedure indicated above is followed but instead of the brightener of the formula (11) equivalent amounts of an optical brightener of the formula 14, 15, 17, 18, 49, 55, 56, 64 or 68 are used and otherwise the same procedure is followed, similar results are obtained.

EXAMPLE 18 388 g of benzene-1,4-dicarboxylic acid dimethyl ester, 300 g of 1,2-ethanediol and 0.4 g of antimony oxide are heated in a stainless steel autoclave, equipped with a stirrer, a gas inlet tube, a vacuum device, a descending condenser and a heating jacket, to 200C external temperature whilst blowing pure nitrogen through the mixture, and are kept at this temperature for 3 hours. In the course thereof, the methanol slowly distils off. 0.4 g of the optical brightener of the formula l l dissolved in 40 g of 1,2-ethanediol, are now carefully introduced into the autoclave with exclusion of air, after the temperature has been allowed to drop to 190C. After completion of the addition, the temperature is raised to 285C external temperature over the course of 1 hour, whereupon 1,2-ethanediol distils off. Thereafter vacuum is applied to the autoclave, the pressure is slowly reduced to 0.2 mm Hg, and the condensation is completed under these conditions over the course of 3 hours. During this operation the mixture is thoroughly stirred.

The liquid condensation polymer is then extruded through the bottom nozzle by means of nitrogen. Monofilaments, which show a brilliant white appearance, can be manufactured from the polymer thus obtained.

Similar effects are obtained if, whilst otherwise using the same procedure, equal amounts of an optical brightener of the formula 14, 15, 17, 18, 49, 55, 56 or 64 are used instead of the abovementioned brightener.

EXAMPLE 19 400 parts of caprolactam, 40 parts of water, 0.4 part of the brightener of the formula (11) and 1.6 parts of titanium dioxide (anatase) are mixed with one another and warmed to about 70C until the mass liquefies. The liquid mixture is introduced into a stainless steel pressure vessel and is heated, with exclusion of oxygen, to a temperature of about 250C over the course of one hour, during which a pressure of to 15 atmospheres is generated. After this time, the water is distilled off and the polymeric mass is subsequently kept for 3 hours at 250C, without application of pressure, in order to degas it completely. In the course thereof, the mass reaches a viscosity which allows the polymer to be extruded in the form of strips or filaments, by means of nitrogen, through a nozzle mounted at the bottom of the pressure vessel. The solidifed polyamide is freed of monomeric constituents by extraction with water. The polyamide fibre obtained by this process is distinguished by a very high degree of whiteness.

If instead of the brightener of the formula 11 the same amounts of an optical brightener of the formula 15, 32, 34, 35 or 53 are used, similar results are obtained.

EXAMPLE 1,000 parts of polyamide chips, obtained in a known manner from hexamethylene adipate are mixed with 5 parts of titanium dioxide and 0.5 part of the optical brightener of the formula (11) in a drum for 10 to 16 hours. The chips treated in this way are fused in an apparatus with exclusion of oxygen and stirred for a short time. Thereafter the melt is spun through spinnerets under a nitrogen atmosphere of 5 atmospheres gauge, and the product is stretched. The polyamide filaments thus obtained show a high degree of whiteness.

Similar effects are obtained if, whilst otherwise following the same procedure, equal amounts of an optical brightener of the formula 15, 32, 34, 35 or 53 are used instead of the brightener of the formula (11).

We claim:

1. A 2Stilbenyl-4-styryl-triazole of the formula wherein X denotes hydrogen, halogen, methyl phenyl, or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine; R denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms, phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chorine; or alkoxy with 1 to 4 carbon atoms, or together with R in the o-position denotes a fused benzene ring, R denotes hydrogen, halogen, alkyl with 1 to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms, or together with R in the o-position denotes a fused benzene ring, R, denotes hydrogen, a nitrile group, or a radical of formula COOZ, CON(Z1Z2), SO Z, SO Z or --SO N(Z,Z where Z is hydrogen, alkyl of 1 to 18 carbon atoms, phenyl, phenyl substituted by chloror, methoxy, ethoxy, methyl, ethyl or t-butyl; or benzyl,

Z is hydrogen, alkyl or 1 to 6 carbon atoms, alkyl of 1 to 6 carbon atoms where the terminal carbon atom contains an N,N-dialkylamino group where the alkyl groups each are of l to 4 carbon atoms or Z, is phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z is hydrogen, alkyl of 1 to 6 carbon atoms, or Z Z and the nitrogen atom form morpholinyl or morpholinyl substituted by alkyl of 1 to 4 carbon atoms,

2;, is alkyl of l to 4 carbon atoms, phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z is a substituent as defined for Z or is alkali metal, ammonium or amino; R denotes hydrogen, halogen, :1 nitrile group, alkyl with l to 4 carbon atoms, phenyl, or phenyl substituted by methyl, ethyl, tbutyl, methoxy, ethoxy or chlorine; alkoxy with l to 4 carbon atoms, or a radical of formula COOZ, CON(Z Z SO Z', SO Z or SO N(Z,Z where Z is hydrogen, alkyl of 1 to 18 carbon atoms, phenyl, phenyl substituted by chloro, methoxy, ethoxy, methyl, ethyl or t-butyl; or benzyl,

Z is hydrogen, alkyl of 1 to 6 carbon atoms, alkyl of 1 to 6 carbon atoms where the terminal carbon atom contains an N,N-dialkylamino group where the alkyl groups each are of 1 to 4 carbon atoms or Z is phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z is hydrogen, alkyl of 1 to 6 carbon atoms, or Z Z and the nitrogen atom form morpholinyl or morpholinyl substituted by alkyl of 1 to 4 carbon atoms,

2;, is alkyl of 1 to 4 carbon atoms, phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z is a substituent as defined for Z or is alkali metal, ammonium or amino; and R denotes hydrogen, alkyl with 1 to 4 carbon atoms or alkoxy with 1 to 4 carbon atoms.

2. A 2-Stilbenyl-4-styryl-triazole according to claim 1, of the formula wherein X, denotes hydrogen or chlorine, R,, denotes hydrogen, chlorine, bromine, alkyl with l to 4 carbon atoms or phenyl, R, denotes hydrogen, chlorine, alkyl with 1 to 4 carbon atoms or alkoxy with l to 4 carbon atoms, R,, denotes hydrogen, nitrile or a radical of formU-la $032 SO2Z3 01' -SO N(Z,Z where Z is hydrogen, alkyl of l to 18 carbon atoms, phenyl, phenyl substituted by chloro, methoxy, ethoxy, methyl, ethyl or t-butyl; or benzyl, Z, is hydrogen, alkyl of l to 6 carbon atoms, alkyl of 1 to 6 carbon atoms where the terminal carbon atom contains an N,N-dialkylamino group where the alkyl groups each are of l to 4 carbon atoms or Z, is phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine; Z is hydrogen, alkyl of l to 6 carbon atoms, or Z,,

Z, and the nitrogen atom form morpholinyl or morpholinyl substituted by alkyl of l to 4 carbon Z, is hydrogen, alkyl of l to 6 carbon atoms, alkyl of 1 to 6 carbon atoms where the terminal carbon atom contains an N,N-dialkylamino group where the alkyl groups each are of l to 4 carbon atoms or Z, is phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z, is hydrogen, alkyl of l to 6 carbon atoms, or Z,,

Z, and the nitrogen atom form morpholinyl or morpholinyl substituted by alkyl of 1 to 4 carbon atoms,

Z is alkyl of l to 4 carbon atoms, phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy or chlorine;

Z is a substituent as defined for Z or is alkali metal, ammonium or amino; and R,,, denotes hydrogen, alkyl with l to 4 carbon atoms or alkoxy with l to 4 carbon atoms.

3. A 2-Stilbenyl-4-styryl-triazole according to Claim 1, of the formula 2,, is alkyl of 1 to 4 carbon atoms, phenyl or phenyl substituted by methyl, ethyl, t-butyl, methoxy, ethoxy. or chlorine;

wherein X, denotes hydrogen or chlorine, R,, denotes hydrogen, alkyl with l to 4 carbon atoms, chlorine, methoxy, or phenyl, R,, denotes carbonamido, a nitrile group, a sulpho group or its sodium salt, SO Y, wherein Y represents methyl, ethyl, methoxy, ethoxy, phenoxy optionally substituted by alkyl with l to 4 carbon atoms or Y is N-alklamino of l to 4 carbon atoms or N-alkylamino of l to 4 carbon atoms where the terminal carbon atom contains an N,N-dialkylamino group where the alkyl group contains 1 or 2 carbon atoms, R,,, denotes hydrogen, chlorine, methyl, methoxy, phenyl, carbomethoxy or carboethoxy and R,, de-

notes hydrogen or methoxy.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent ,862,179 Dated January 21, 1975 Inventofls) Kabas et a1.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 1 Column 18, line 16 delete "chloror" and substitute -chloro'--.

Signed and sealed this 9th day of April 1975.

(SEAL) Attest:

C. MARSHALL. DANN v RUTH C. MASON Commissioner of Patents attesting Officer 5 and Trademarks USCOMM-DC 6037o-P69 I 0.5. eovtlrmnu' nnmuc omcl I!" o-an-au 1 FORM PO-1050 (10-69) 

2. A 2-Stilbenyl-4-styryl-triazole according to claim 1, of the formula
 3. A 2-Stilbenyl-4-styryl-triazole according to Claim 1, of the formula 